Structural pipe



FIG. 1 is a top, front, right side perspective view of a structural pipe showing our new design;

FIG. 2 is a front elevational view;

FIG. 3 is a right side elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a cross sectional view taken on line V--V of FIG. 2; and,

FIG. 6 is a reduced perspective view, the broken line showing of pipes, wires, plates and wheels, the full line showing of the structural pipes and additional structural pipes being for illustrative purposes only. 

The ornamental design for a structural pipe, as shown and described. 